<script lang="ts" setup name="GoodsImage">
import { computed, PropType, ref } from 'vue';
import {useMouseInElement } from '@vueuse/core'
  defineProps({
    images:{
      type:Array as PropType<string[]>,
      required:true
    }
  })
  const active = ref(0)
  // 遮罩跟随
  const target = ref(null)
  const {elementX,elementY,isOutside } = useMouseInElement(target)
  // 限制遮罩范围
  const position = computed(()=>{
    let x = elementX.value -100
    let y = elementY.value -100
    if(x<=0)x=0
    if(y<=0)y=0
    if(x>=200)x=200
    if(y>=200)y=200
    return{x,y}
  })
</script>
<template>
  <div class="goods-image">
    <!-- 右侧放大容器 -->
    <div class="large" v-show="!isOutside" :style="[{backgroundImage:`url(${images[active]})`,
  backgroundPosition:`${-position.x*2}px ${-position.y*2}px`
  }]"></div>
    <div class="middle">
      <!-- 遮罩 -->
      <div class="layer" v-show="!isOutside" :style="{left:position.x+'px',top:position.y+'px'}"></div>
      <!-- 左侧大图片 -->
      <img
      ref="target"
        :src="images[active]"
        alt=""
      />
    </div>
    <ul class="small">
      <li v-for="(item,index) in images" :key="item"
       :class="{ active: index === active }"
       @mouseenter="active=index"
       >
        <img
          :src="item"
          alt=""
        />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
   z-index: 500;
 .large {
   position: absolute;
   top: 0;
   left: 412px;
   width: 400px;
   height: 400px;
   box-shadow: 0 0 10px rgba(0,0,0,0.1);
   background-repeat: no-repeat;
   background-size: 800px 800px;
   background-color: #f8f8f8;
 }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
   cursor: move;
   .layer {
     width: 200px;
     height: 200px;
     background: rgba(0,0,0,.2);
     left: 0;
     top: 0;
     position: absolute;
   }
  }
  .small {
    width: 80px;
    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;
      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>